Phylum Mollusca Linnaeus, 1758 - molluscs Class Polyplacophora Blainville, 1816 [monotypic] - chitons Subclass Polyplacophora Gray, 1821 [monotypic] see Class Polyplacophora Blainville, 1816 Order Lepidopleurida Thiele, 1910 Suborder Acanthochitonina Bergenhayn, 1930 Family Cryptoplacidae H. Adams & A. Adams, 1858 [monotypic] Genus Cryptoplax Blainville, 1818